There has been a recent flurry of messages from web masters who would
like better tools to check if their web pages are dangerous. I spent
the last few evenings, writing a tool that can help exactly with
that. The result is SpyBye:

http://www.spybye.org/

SpyBye has been implemented as a simple proxy server on top of
libevent. To start, you need to configure your web browser to use
SpyBye as proxy. SpyBye then traces all requests made as a result of
visiting a web page and classifies them into harmless, unknown and
dangerous. The classification is based on patterns and not very
sophisticated. However, by using your browser to drive a web page, we
get to see requests that might otherwise be hidden from us, for
example, due to javascript obfuscation.

Once an URL has been analyzed, you see a result similar to this:

http://www.spybye.org/uploads/spybye.jpg

Based on the analysis, it should be straight forward to determine if
your web site does something unexpected.